1a6701122c
As part of the preparation to the switch interceptor feature, this function is changed to return error instead of error channel that is closed automatically. Returning an error channel has become complex to maintain and implement when adding more asynchronous flows to the switch. The change doesn't affect the current behavior which logs the errors as before.
675 lines
19 KiB
Go
675 lines
19 KiB
Go
package htlcswitch
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import (
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prand "math/rand"
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"reflect"
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"testing"
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"time"
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"github.com/davecgh/go-spew/spew"
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"github.com/lightningnetwork/lnd/clock"
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"github.com/lightningnetwork/lnd/lnwire"
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)
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const testExpiry = time.Minute
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// TestMailBoxCouriers tests that both aspects of the mailBox struct works
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// properly. Both packets and messages should be able to added to each
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// respective mailbox concurrently, and also messages/packets should also be
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// able to be received concurrently.
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func TestMailBoxCouriers(t *testing.T) {
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t.Parallel()
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// First, we'll create new instance of the current default mailbox
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// type.
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ctx := newMailboxContext(t, time.Now(), testExpiry)
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defer ctx.mailbox.Stop()
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// We'll be adding 10 message of both types to the mailbox.
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const numPackets = 10
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const halfPackets = numPackets / 2
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// We'll add a set of random packets to the mailbox.
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sentPackets := make([]*htlcPacket, numPackets)
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for i := 0; i < numPackets; i++ {
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pkt := &htlcPacket{
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outgoingChanID: lnwire.NewShortChanIDFromInt(uint64(prand.Int63())),
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incomingChanID: lnwire.NewShortChanIDFromInt(uint64(prand.Int63())),
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amount: lnwire.MilliSatoshi(prand.Int63()),
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htlc: &lnwire.UpdateAddHTLC{
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ID: uint64(i),
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},
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}
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sentPackets[i] = pkt
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err := ctx.mailbox.AddPacket(pkt)
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if err != nil {
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t.Fatalf("unable to add packet: %v", err)
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}
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}
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// Next, we'll do the same, but this time adding wire messages.
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sentMessages := make([]lnwire.Message, numPackets)
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for i := 0; i < numPackets; i++ {
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msg := &lnwire.UpdateAddHTLC{
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ID: uint64(prand.Int63()),
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Amount: lnwire.MilliSatoshi(prand.Int63()),
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}
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sentMessages[i] = msg
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err := ctx.mailbox.AddMessage(msg)
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if err != nil {
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t.Fatalf("unable to add message: %v", err)
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}
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}
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// Now we'll attempt to read back the packets/messages we added to the
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// mailbox. We'll alternative reading from the message outbox vs the
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// packet outbox to ensure that they work concurrently properly.
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recvdPackets := make([]*htlcPacket, 0, numPackets)
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recvdMessages := make([]lnwire.Message, 0, numPackets)
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for i := 0; i < numPackets*2; i++ {
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timeout := time.After(time.Second * 5)
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if i%2 == 0 {
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select {
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case <-timeout:
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t.Fatalf("didn't recv pkt after timeout")
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case pkt := <-ctx.mailbox.PacketOutBox():
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recvdPackets = append(recvdPackets, pkt)
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}
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} else {
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select {
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case <-timeout:
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t.Fatalf("didn't recv message after timeout")
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case msg := <-ctx.mailbox.MessageOutBox():
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recvdMessages = append(recvdMessages, msg)
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}
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}
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}
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// The number of messages/packets we sent, and the number we received
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// should match exactly.
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if len(sentPackets) != len(recvdPackets) {
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t.Fatalf("expected %v packets instead got %v", len(sentPackets),
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len(recvdPackets))
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}
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if len(sentMessages) != len(recvdMessages) {
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t.Fatalf("expected %v messages instead got %v", len(sentMessages),
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len(recvdMessages))
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}
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// Additionally, the set of packets should match exactly, as we should
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// have received the packets in the exact same ordering that we added.
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if !reflect.DeepEqual(sentPackets, recvdPackets) {
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t.Fatalf("recvd packets mismatched: expected %v, got %v",
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spew.Sdump(sentPackets), spew.Sdump(recvdPackets))
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}
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if !reflect.DeepEqual(recvdMessages, recvdMessages) {
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t.Fatalf("recvd messages mismatched: expected %v, got %v",
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spew.Sdump(sentMessages), spew.Sdump(recvdMessages))
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}
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// Now that we've received all of the intended msgs/pkts, ack back half
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// of the packets.
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for _, recvdPkt := range recvdPackets[:halfPackets] {
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ctx.mailbox.AckPacket(recvdPkt.inKey())
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}
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// With the packets drained and partially acked, we reset the mailbox,
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// simulating a link shutting down and then coming back up.
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err := ctx.mailbox.ResetMessages()
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if err != nil {
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t.Fatalf("unable to reset messages: %v", err)
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}
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err = ctx.mailbox.ResetPackets()
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if err != nil {
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t.Fatalf("unable to reset packets: %v", err)
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}
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// Now, we'll use the same alternating strategy to read from our
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// mailbox. All wire messages are dropped on startup, but any unacked
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// packets will be replayed in the same order they were delivered
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// initially.
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recvdPackets2 := make([]*htlcPacket, 0, halfPackets)
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for i := 0; i < 2*halfPackets; i++ {
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timeout := time.After(time.Second * 5)
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if i%2 == 0 {
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select {
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case <-timeout:
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t.Fatalf("didn't recv pkt after timeout")
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case pkt := <-ctx.mailbox.PacketOutBox():
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recvdPackets2 = append(recvdPackets2, pkt)
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}
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} else {
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select {
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case <-ctx.mailbox.MessageOutBox():
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t.Fatalf("should not receive wire msg after reset")
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default:
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}
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}
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}
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// The number of packets we received should match the number of unacked
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// packets left in the mailbox.
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if halfPackets != len(recvdPackets2) {
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t.Fatalf("expected %v packets instead got %v", halfPackets,
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len(recvdPackets))
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}
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// Additionally, the set of packets should match exactly with the
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// unacked packets, and we should have received the packets in the exact
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// same ordering that we added.
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if !reflect.DeepEqual(recvdPackets[halfPackets:], recvdPackets2) {
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t.Fatalf("recvd packets mismatched: expected %v, got %v",
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spew.Sdump(sentPackets), spew.Sdump(recvdPackets))
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}
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}
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// TestMailBoxResetAfterShutdown tests that ResetMessages and ResetPackets
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// return ErrMailBoxShuttingDown after the mailbox has been stopped.
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func TestMailBoxResetAfterShutdown(t *testing.T) {
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t.Parallel()
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ctx := newMailboxContext(t, time.Now(), time.Second)
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// Stop the mailbox, then try to reset the message and packet couriers.
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ctx.mailbox.Stop()
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err := ctx.mailbox.ResetMessages()
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if err != ErrMailBoxShuttingDown {
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t.Fatalf("expected ErrMailBoxShuttingDown, got: %v", err)
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}
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err = ctx.mailbox.ResetPackets()
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if err != ErrMailBoxShuttingDown {
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t.Fatalf("expected ErrMailBoxShuttingDown, got: %v", err)
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}
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}
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type mailboxContext struct {
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t *testing.T
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mailbox MailBox
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clock *clock.TestClock
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forwards chan *htlcPacket
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}
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func newMailboxContext(t *testing.T, startTime time.Time,
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expiry time.Duration) *mailboxContext {
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ctx := &mailboxContext{
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t: t,
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clock: clock.NewTestClock(startTime),
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forwards: make(chan *htlcPacket, 1),
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}
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ctx.mailbox = newMemoryMailBox(&mailBoxConfig{
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fetchUpdate: func(sid lnwire.ShortChannelID) (
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*lnwire.ChannelUpdate, error) {
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return &lnwire.ChannelUpdate{
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ShortChannelID: sid,
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}, nil
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},
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forwardPackets: ctx.forward,
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clock: ctx.clock,
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expiry: expiry,
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})
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ctx.mailbox.Start()
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return ctx
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}
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func (c *mailboxContext) forward(_ chan struct{},
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pkts ...*htlcPacket) error {
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for _, pkt := range pkts {
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c.forwards <- pkt
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}
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return nil
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}
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func (c *mailboxContext) sendAdds(start, num int) []*htlcPacket {
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c.t.Helper()
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sentPackets := make([]*htlcPacket, num)
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for i := 0; i < num; i++ {
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pkt := &htlcPacket{
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outgoingChanID: lnwire.NewShortChanIDFromInt(
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uint64(prand.Int63())),
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incomingChanID: lnwire.NewShortChanIDFromInt(
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uint64(prand.Int63())),
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incomingHTLCID: uint64(start + i),
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amount: lnwire.MilliSatoshi(prand.Int63()),
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htlc: &lnwire.UpdateAddHTLC{
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ID: uint64(start + i),
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},
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}
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sentPackets[i] = pkt
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err := c.mailbox.AddPacket(pkt)
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if err != nil {
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c.t.Fatalf("unable to add packet: %v", err)
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}
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}
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return sentPackets
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}
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func (c *mailboxContext) receivePkts(pkts []*htlcPacket) {
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c.t.Helper()
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for i, expPkt := range pkts {
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select {
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case pkt := <-c.mailbox.PacketOutBox():
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if reflect.DeepEqual(expPkt, pkt) {
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continue
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}
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c.t.Fatalf("inkey mismatch #%d, want: %v vs "+
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"got: %v", i, expPkt.inKey(), pkt.inKey())
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case <-time.After(50 * time.Millisecond):
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c.t.Fatalf("did not receive fail for index %d", i)
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}
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}
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}
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func (c *mailboxContext) checkFails(adds []*htlcPacket) {
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c.t.Helper()
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for i, add := range adds {
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select {
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case fail := <-c.forwards:
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if add.inKey() == fail.inKey() {
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continue
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}
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c.t.Fatalf("inkey mismatch #%d, add: %v vs fail: %v",
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i, add.inKey(), fail.inKey())
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case <-time.After(50 * time.Millisecond):
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c.t.Fatalf("did not receive fail for index %d", i)
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}
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}
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select {
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case pkt := <-c.forwards:
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c.t.Fatalf("unexpected forward: %v", pkt)
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case <-time.After(50 * time.Millisecond):
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}
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}
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// TestMailBoxFailAdd asserts that FailAdd returns a response to the switch
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// under various interleavings with other operations on the mailbox.
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func TestMailBoxFailAdd(t *testing.T) {
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var (
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batchDelay = time.Second
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expiry = time.Minute
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firstBatchStart = time.Now()
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secondBatchStart = time.Now().Add(batchDelay)
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thirdBatchStart = time.Now().Add(2 * batchDelay)
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thirdBatchExpiry = thirdBatchStart.Add(expiry)
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)
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ctx := newMailboxContext(t, firstBatchStart, expiry)
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defer ctx.mailbox.Stop()
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failAdds := func(adds []*htlcPacket) {
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for _, add := range adds {
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ctx.mailbox.FailAdd(add)
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}
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}
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const numBatchPackets = 5
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// Send 10 adds, and pull them from the mailbox.
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firstBatch := ctx.sendAdds(0, numBatchPackets)
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ctx.receivePkts(firstBatch)
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// Fail all of these adds, simulating an error adding the HTLCs to the
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// commitment. We should see a failure message for each.
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go failAdds(firstBatch)
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ctx.checkFails(firstBatch)
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// As a sanity check, Fail all of them again and assert that no
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// duplicate fails are sent.
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go failAdds(firstBatch)
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ctx.checkFails(nil)
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// Now, send a second batch of adds after a short delay and deliver them
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// to the link.
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ctx.clock.SetTime(secondBatchStart)
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secondBatch := ctx.sendAdds(numBatchPackets, numBatchPackets)
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ctx.receivePkts(secondBatch)
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// Reset the packet queue w/o changing the current time. This simulates
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// the link flapping and coming back up before the second batch's
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// expiries have elapsed. We should see no failures sent back.
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err := ctx.mailbox.ResetPackets()
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if err != nil {
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t.Fatalf("unable to reset packets: %v", err)
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}
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ctx.checkFails(nil)
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// Redeliver the second batch to the link and hold them there.
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ctx.receivePkts(secondBatch)
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// Send a third batch of adds shortly after the second batch.
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ctx.clock.SetTime(thirdBatchStart)
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thirdBatch := ctx.sendAdds(2*numBatchPackets, numBatchPackets)
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// Advance the clock so that the third batch expires. We expect to only
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// see fails for the third batch, since the second batch is still being
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// held by the link.
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ctx.clock.SetTime(thirdBatchExpiry)
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ctx.checkFails(thirdBatch)
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// Finally, reset the link which should cause the second batch to be
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// cancelled immediately.
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err = ctx.mailbox.ResetPackets()
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if err != nil {
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t.Fatalf("unable to reset packets: %v", err)
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}
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ctx.checkFails(secondBatch)
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}
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// TestMailBoxPacketPrioritization asserts that the mailbox will prioritize
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// delivering Settle and Fail packets over Adds if both are available for
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// delivery at the same time.
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func TestMailBoxPacketPrioritization(t *testing.T) {
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t.Parallel()
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// First, we'll create new instance of the current default mailbox
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// type.
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ctx := newMailboxContext(t, time.Now(), testExpiry)
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defer ctx.mailbox.Stop()
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const numPackets = 5
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_, _, aliceChanID, bobChanID := genIDs()
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// Next we'll send the following sequence of packets:
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// - Settle1
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// - Add1
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// - Add2
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// - Fail
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// - Settle2
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sentPackets := make([]*htlcPacket, numPackets)
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for i := 0; i < numPackets; i++ {
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pkt := &htlcPacket{
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outgoingChanID: aliceChanID,
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outgoingHTLCID: uint64(i),
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incomingChanID: bobChanID,
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incomingHTLCID: uint64(i),
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amount: lnwire.MilliSatoshi(prand.Int63()),
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}
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switch i {
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case 0, 4:
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// First and last packets are a Settle. A non-Add is
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// sent first to make the test deterministic w/o needing
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// to sleep.
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pkt.htlc = &lnwire.UpdateFulfillHTLC{ID: uint64(i)}
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case 1, 2:
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// Next two packets are Adds.
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pkt.htlc = &lnwire.UpdateAddHTLC{ID: uint64(i)}
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case 3:
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// Last packet is a Fail.
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pkt.htlc = &lnwire.UpdateFailHTLC{ID: uint64(i)}
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}
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sentPackets[i] = pkt
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err := ctx.mailbox.AddPacket(pkt)
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if err != nil {
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t.Fatalf("failed to add packet: %v", err)
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}
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}
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// When dequeueing the packets, we expect the following sequence:
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// - Settle1
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// - Fail
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// - Settle2
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// - Add1
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// - Add2
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//
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// We expect to see Fail and Settle2 to be delivered before either Add1
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// or Add2 due to the prioritization between the split queue.
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for i := 0; i < numPackets; i++ {
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select {
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case pkt := <-ctx.mailbox.PacketOutBox():
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var expPkt *htlcPacket
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switch i {
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case 0:
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// First packet should be Settle1.
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expPkt = sentPackets[0]
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case 1:
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// Second packet should be Fail.
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expPkt = sentPackets[3]
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case 2:
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// Third packet should be Settle2.
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expPkt = sentPackets[4]
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case 3:
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// Fourth packet should be Add1.
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expPkt = sentPackets[1]
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case 4:
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// Last packet should be Add2.
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expPkt = sentPackets[2]
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}
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if !reflect.DeepEqual(expPkt, pkt) {
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t.Fatalf("recvd packet mismatch %d, want: %v, got: %v",
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i, spew.Sdump(expPkt), spew.Sdump(pkt))
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}
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case <-time.After(50 * time.Millisecond):
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t.Fatalf("didn't receive packet %d before timeout", i)
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}
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}
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}
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// TestMailBoxAddExpiry asserts that the mailbox will cancel back Adds that have
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// reached their expiry time.
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func TestMailBoxAddExpiry(t *testing.T) {
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var (
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expiry = time.Minute
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batchDelay = time.Second
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firstBatchStart = time.Now()
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firstBatchExpiry = firstBatchStart.Add(expiry)
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secondBatchStart = firstBatchStart.Add(batchDelay)
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secondBatchExpiry = secondBatchStart.Add(expiry)
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)
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ctx := newMailboxContext(t, firstBatchStart, expiry)
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defer ctx.mailbox.Stop()
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// Each batch will consist of 10 messages.
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const numBatchPackets = 10
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firstBatch := ctx.sendAdds(0, numBatchPackets)
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ctx.clock.SetTime(secondBatchStart)
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ctx.checkFails(nil)
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secondBatch := ctx.sendAdds(numBatchPackets, numBatchPackets)
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ctx.clock.SetTime(firstBatchExpiry)
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ctx.checkFails(firstBatch)
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ctx.clock.SetTime(secondBatchExpiry)
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ctx.checkFails(secondBatch)
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}
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// TestMailBoxDuplicateAddPacket asserts that the mailbox returns an
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// ErrPacketAlreadyExists failure when two htlcPackets are added with identical
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// incoming circuit keys.
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func TestMailBoxDuplicateAddPacket(t *testing.T) {
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t.Parallel()
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ctx := newMailboxContext(t, time.Now(), testExpiry)
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ctx.mailbox.Start()
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defer ctx.mailbox.Stop()
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addTwice := func(t *testing.T, pkt *htlcPacket) {
|
|
// The first add should succeed.
|
|
err := ctx.mailbox.AddPacket(pkt)
|
|
if err != nil {
|
|
t.Fatalf("unable to add packet: %v", err)
|
|
}
|
|
|
|
// Adding again with the same incoming circuit key should fail.
|
|
err = ctx.mailbox.AddPacket(pkt)
|
|
if err != ErrPacketAlreadyExists {
|
|
t.Fatalf("expected ErrPacketAlreadyExists, got: %v", err)
|
|
}
|
|
}
|
|
|
|
// Assert duplicate AddPacket calls fail for all types of HTLCs.
|
|
addTwice(t, &htlcPacket{
|
|
incomingHTLCID: 0,
|
|
htlc: &lnwire.UpdateAddHTLC{},
|
|
})
|
|
addTwice(t, &htlcPacket{
|
|
incomingHTLCID: 1,
|
|
htlc: &lnwire.UpdateFulfillHTLC{},
|
|
})
|
|
addTwice(t, &htlcPacket{
|
|
incomingHTLCID: 2,
|
|
htlc: &lnwire.UpdateFailHTLC{},
|
|
})
|
|
}
|
|
|
|
// TestMailOrchestrator asserts that the orchestrator properly buffers packets
|
|
// for channels that haven't been made live, such that they are delivered
|
|
// immediately after BindLiveShortChanID. It also tests that packets are delivered
|
|
// readily to mailboxes for channels that are already in the live state.
|
|
func TestMailOrchestrator(t *testing.T) {
|
|
t.Parallel()
|
|
|
|
// First, we'll create a new instance of our orchestrator.
|
|
mo := newMailOrchestrator(&mailOrchConfig{
|
|
fetchUpdate: func(sid lnwire.ShortChannelID) (
|
|
*lnwire.ChannelUpdate, error) {
|
|
return &lnwire.ChannelUpdate{
|
|
ShortChannelID: sid,
|
|
}, nil
|
|
},
|
|
forwardPackets: func(_ chan struct{},
|
|
pkts ...*htlcPacket) error {
|
|
return nil
|
|
},
|
|
clock: clock.NewTestClock(time.Now()),
|
|
expiry: testExpiry,
|
|
})
|
|
defer mo.Stop()
|
|
|
|
// We'll be delivering 10 htlc packets via the orchestrator.
|
|
const numPackets = 10
|
|
const halfPackets = numPackets / 2
|
|
|
|
// Before any mailbox is created or made live, we will deliver half of
|
|
// the htlcs via the orchestrator.
|
|
chanID1, chanID2, aliceChanID, bobChanID := genIDs()
|
|
sentPackets := make([]*htlcPacket, halfPackets)
|
|
for i := 0; i < halfPackets; i++ {
|
|
pkt := &htlcPacket{
|
|
outgoingChanID: aliceChanID,
|
|
outgoingHTLCID: uint64(i),
|
|
incomingChanID: bobChanID,
|
|
incomingHTLCID: uint64(i),
|
|
amount: lnwire.MilliSatoshi(prand.Int63()),
|
|
htlc: &lnwire.UpdateAddHTLC{
|
|
ID: uint64(i),
|
|
},
|
|
}
|
|
sentPackets[i] = pkt
|
|
|
|
mo.Deliver(pkt.outgoingChanID, pkt)
|
|
}
|
|
|
|
// Now, initialize a new mailbox for Alice's chanid.
|
|
mailbox := mo.GetOrCreateMailBox(chanID1, aliceChanID)
|
|
|
|
// Verify that no messages are received, since Alice's mailbox has not
|
|
// been made live.
|
|
for i := 0; i < halfPackets; i++ {
|
|
timeout := time.After(50 * time.Millisecond)
|
|
select {
|
|
case <-mailbox.MessageOutBox():
|
|
t.Fatalf("should not receive wire msg after reset")
|
|
case <-timeout:
|
|
}
|
|
}
|
|
|
|
// Assign a short chan id to the existing mailbox, make it available for
|
|
// capturing incoming HTLCs. The HTLCs added above should be delivered
|
|
// immediately.
|
|
mo.BindLiveShortChanID(mailbox, chanID1, aliceChanID)
|
|
|
|
// Verify that all of the packets are queued and delivered to Alice's
|
|
// mailbox.
|
|
recvdPackets := make([]*htlcPacket, 0, len(sentPackets))
|
|
for i := 0; i < halfPackets; i++ {
|
|
timeout := time.After(5 * time.Second)
|
|
select {
|
|
case <-timeout:
|
|
t.Fatalf("didn't recv pkt %d after timeout", i)
|
|
case pkt := <-mailbox.PacketOutBox():
|
|
recvdPackets = append(recvdPackets, pkt)
|
|
}
|
|
}
|
|
|
|
// We should have received half of the total number of packets.
|
|
if len(recvdPackets) != halfPackets {
|
|
t.Fatalf("expected %v packets instead got %v",
|
|
halfPackets, len(recvdPackets))
|
|
}
|
|
|
|
// Check that the received packets are equal to the sent packets.
|
|
if !reflect.DeepEqual(recvdPackets, sentPackets) {
|
|
t.Fatalf("recvd packets mismatched: expected %v, got %v",
|
|
spew.Sdump(sentPackets), spew.Sdump(recvdPackets))
|
|
}
|
|
|
|
// For the second half of the test, create a new mailbox for Bob and
|
|
// immediately make it live with an assigned short chan id.
|
|
mailbox = mo.GetOrCreateMailBox(chanID2, bobChanID)
|
|
mo.BindLiveShortChanID(mailbox, chanID2, bobChanID)
|
|
|
|
// Create the second half of our htlcs, and deliver them via the
|
|
// orchestrator. We should be able to receive each of these in order.
|
|
recvdPackets = make([]*htlcPacket, 0, len(sentPackets))
|
|
for i := 0; i < halfPackets; i++ {
|
|
pkt := &htlcPacket{
|
|
outgoingChanID: aliceChanID,
|
|
outgoingHTLCID: uint64(halfPackets + i),
|
|
incomingChanID: bobChanID,
|
|
incomingHTLCID: uint64(halfPackets + i),
|
|
amount: lnwire.MilliSatoshi(prand.Int63()),
|
|
htlc: &lnwire.UpdateAddHTLC{
|
|
ID: uint64(halfPackets + i),
|
|
},
|
|
}
|
|
sentPackets[i] = pkt
|
|
|
|
mo.Deliver(pkt.incomingChanID, pkt)
|
|
|
|
timeout := time.After(50 * time.Millisecond)
|
|
select {
|
|
case <-timeout:
|
|
t.Fatalf("didn't recv pkt %d after timeout", halfPackets+i)
|
|
case pkt := <-mailbox.PacketOutBox():
|
|
recvdPackets = append(recvdPackets, pkt)
|
|
}
|
|
}
|
|
|
|
// Again, we should have received half of the total number of packets.
|
|
if len(recvdPackets) != halfPackets {
|
|
t.Fatalf("expected %v packets instead got %v",
|
|
halfPackets, len(recvdPackets))
|
|
}
|
|
|
|
// Check that the received packets are equal to the sent packets.
|
|
if !reflect.DeepEqual(recvdPackets, sentPackets) {
|
|
t.Fatalf("recvd packets mismatched: expected %v, got %v",
|
|
spew.Sdump(sentPackets), spew.Sdump(recvdPackets))
|
|
}
|
|
}
|